You missed out random nutters, trolls, obsessives and stalkers.
You also failed to mention dull civvy cunts, desperate fat lasses and deranged meths drinkers.
The angry, ill informed and politically extreme probably fall into other existing categries.
There is also a small minority of erudite and interesting posters who contribute reasoned debate, informed opinion and good advice. Their posts are invariably worth reading and I have learned a lot from them. Alongside the wise, there are still some genuinely funny individuals. A few of the threads on here are hilarious and I (literally) haven't laughed so hard since I was wearing DPM.
The wise and the funny probably account for about 2% of the Arrse bandwidth......
There seem to be a few other categories missing. What about increasingly improbable Falklands-related scenarios, the need for carrier aviation, why the RAF should be disbanded, why the RAF Regiment should be disbanded, bone questions about recruitment (with specific reference to the need for a private income), ritual cyberspace dismemberment of any poster even slightly left of centre and, finally, lunatic postings from internet stalkers, monomaniacs and the clinically insane (the recent Peter Dow effusion)?
Surely at least 50% is made up of Porn, Women you want to shag, Women you shouldn't but would, Porn Stars, naked Women, Women who take it up the Arrse, Celebs you would shag, Celebs you wouldn't but would really, and for Cuddles Ginger Women you would/wouldn't but Cuddles would.